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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]        
Net (loss) income $ (125) $ 1,996 $ 99 $ 429
Less: Net loss (income) attributable to noncontrolling interests 2 (107) (127) (101)
Other comprehensive (loss) income items:        
Actuarial (losses) gains associated with pension and postretirement plans [1] (8) (2) (24) 13
Reclassification of realized losses on pension and postretirement to income [1] 0 2 7 4
Total other comprehensive (loss) income (8) 0 (17) 17
Comprehensive (loss) income attributable to common stock $ (131) $ 1,889 $ (45) $ 345
[1] No associated tax has been recorded for the components of other comprehensive (loss) income for 2020, 2019 or 2018. See Note 17 Pension and Postretirement Benefit Plans for additional information on the components of other comprehensive income related to our defined benefit plans.